General

Exposed metal surfaces shall be painted with an air-dry beige direct to metal single component paint prior to shipment. Each unit shall ship with a full operating charge of refrigerant and oil. Molded neoprene isolation pads shall be supplied for placement under all support points. Start-up and operator instruction by factory-trained service personnel shall be included.

Compressor-Motor

The unit shall have a semihermetic, direct-drive, 3600 rpm (3000 rpm 50 Hz), rotary compressor with: capacity control slide valve, oil sump heater and differential pressure refrigerant oil flow system. Four pressure lubricated rolling element bearing groups shall support the rotating assembly. Motor shall be a suction gas-cooled, hermetically sealed, two-pole, squirrel cage induction-type.

Evaporator-Condenser

Shells shall be carbon steel plate. Evaporator and condenser shall be designed, tested and stamped in accordance with ASME Code for refrigerant side working side pressure of 200 psig.

All tube sheets shall be carbon steel. Evaporator and condenser tubes should be individually replaceable. Standard tubes shall be externally finned, internally enhanced seamless copper with lands at all tube sheets. Evaporator tubes shall be 1.0-inch diameter. Condenser tubes shall be 3 /4- -inch diameter. Tubes shall be mechanically expanded into tube sheets. Condenser and evaporator tubes shall be mechanically fastened to tube supports.

All water pass arrangements shall be available with grooved connections (150 or 300 psig waterside). All connections may be either right or left handed. Waterside shall be hydrostatically tested at 1 1 /2 times design working pressure.

Refrigerant Circuit

An electronically controlled expansion valve shall be provided to maintain proper refrigerant flow.
Unit Control Panel (UCP2 ™ ) The microprocessor-based control panel shall be factory-installed and tested. The control system shall be powered by a control power transformer. The controller will load and unload the chiller via control of the compressor slide valve. Microprocessor based chilled water reset based on return water shall be standard.

The UCP2 utilizing the Adaptive Control ™ microprocessor automatically shall take action to prevent unit shutdown due to abnormal operating conditions associated with low evaporator refrigerant temperature, high condensing temperature, and motor current overload. If the abnormal operating condition continues and the protective limit is reached, the machine will be shut down.

The panel shall include machine protection shutdown requiring manual reset for:

• low evaporator refrigerant temperature and pressure
• high condenser refrigerant pressure
• low oil flow
• critical sensor or detection circuit faults
• motor current overload
• high compressor discharge temperature
• communications lost between modules
• electrical distribution faults: phase loss, phase imbalance, phase reversal
• external and local emergency stop
• starter transition failure

The panel shall include machine protection shutdown with automatic reset when the condition is corrected for:

• momentary power loss
• under/overvoltage
• loss of evaporator or condenser water flow

Over 100 diagnostic checks shall be made and displayed when a fault is detected. The display shall indicate the fault, the type of reset required, the time and date the diagnostic occurred, the mode in which the machine was operating at the time of the diagnostic, and a help message. A diagnostic history shall display the last 20 diagnostics with the time and date of their occurrence.